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30 N horizontal force is required to pull a plate of area 1 m2 with constant velocity of 2 m/s over a thin film of oil of thickness 0.25mm, then viscosity of the oil in N−S/m2, is

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a

375×10−5

b

275×10−4

c

8.25×10−6

d

12.2×10−6

answer is A.

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Detailed Solution

For thin film, viscous drag, FD=ηAVd∴ η=FD.dA.V=30×0.25×10−31×2N−Sm2=375×10−5 N−Sm2

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30 N horizontal force is required to pull a plate of area 1 m2 with constant velocity of 2 m/s over a thin film of oil of thickness 0.25mm, then viscosity of the oil in N−S/m2, is